package com.atguigu.distributed.lock.juc;

import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.ReentrantReadWriteLock;

class MyCache{
    private Map<String,Object> map = new HashMap<>();
    private ReentrantReadWriteLock rwLock = new ReentrantReadWriteLock();
    public void put(String key,Object value){
        rwLock.writeLock().lock();
        try {
            System.out.println(Thread.currentThread().getName()+"\t 正在写入:"+key);
            try{
                TimeUnit.MILLISECONDS.sleep(300);
            }catch (Exception e){
                e.printStackTrace();
            }
            map.put(key, value);
            System.out.println(Thread.currentThread().getName()+"\t 写入完成:"+key);
                }catch (Exception e){
                    e.printStackTrace();
                }finally {
                    rwLock.writeLock().unlock();
                }

    }
    public Object get(String key){
        rwLock.readLock().lock();
        try {
            System.out.println(Thread.currentThread().getName()+"\t 正在读取:"+key);
            try{
                TimeUnit.MILLISECONDS.sleep(300);
            }catch (Exception e){
                e.printStackTrace();
            }
            Object result = map.get(key);
            System.out.println(Thread.currentThread().getName()+"\t 读取完成:"+result);
                }catch (Exception e){
                    e.printStackTrace();
                }finally {
            rwLock.readLock().unlock();
                }


        return null;
    }

}

public class ReadWriteLockDemo {
    public static void main(String[] args) {
        MyCache myCache = new MyCache();
        for (int i = 1; i <= 5; i++) {
            final int tempInt = i;
            new Thread(() -> {
                myCache.put(tempInt+"",tempInt+"");
            },String.valueOf(i)).start();
        }
        for (int i = 1; i <= 5; i++) {
            final int tempInt = i;
            new Thread(() -> {
                myCache.get(tempInt+"");
            },String.valueOf(i)).start();
        }

    }
}
